Which statement(s) about human neuromuscular innervation is/are true? A. A single spinal motor neuron innervates multiple muscle fibers. B. The majority muscle fibers are innervated by two or more motor neurons. C. Polyneuronal innervation of adult muscles fibers is possible, but rather rare. D. Each spinal motor neuron innervates a single skeletal muscle fiber.
Which statement(s) about human neuromuscular innervation is/are true? A. A single spinal motor neuron innervates multiple muscle fibers. B. The majority muscle fibers are innervated by two or more motor neurons. C. Polyneuronal innervation of adult muscles fibers is possible, but rather rare. D. Each spinal motor neuron innervates a single skeletal muscle fiber.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Which statement(s) about human neuromuscular innervation is/are true?
A. A single spinal motor neuron innervates multiple muscle fibers.
B. The majority muscle fibers are innervated by two or more motor neurons.
C. Polyneuronal innervation of adult muscles fibers is possible, but rather rare.
D. Each spinal motor neuron innervates a single skeletal muscle fiber.
Expert Solution
Step 1
A chemical synapse between a motor neuron and a muscle fibre is known as a neuromuscular junction. It enables the motor neuron to send a signal to the muscle fibre, producing contraction of the muscle. Innervation is required for muscles to function—and even only to maintain muscular tone and avoid atrophy.
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